The Balabansai Formation (sometimes transcribed Balabansay, also known as Balabansai Svita) is a geological

formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondary ...

in Kazakhstan, Kyrgyzstan and Uzbekistan whose strata date back to the

Bathonian In the geologic timescale the Bathonian is an age and stage of the Middle Jurassic. It lasted from approximately 168.3 Ma to around 166.1 Ma (million years ago). The Bathonian Age succeeds the Bajocian Age and precedes the Callovian Age. St ...

and

Callovian In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 166.1 ± 4.0 Ma (million years ago) and 163.5 ± 4.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the ...

stages of the

Middle Jurassic The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 163.5 million years ago. Fossils of land-dwelling animals, such as dinosaurs, from the Middle Jurassic are relatively rare, but geological formations ...

. Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Jurassic, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 550–552. . The lithology primarily consists of variegated sandstones, siltstones, claystones, and rare gravels and marls. Many taxa have been found in the formation, including amphibians and mammals

Vertebrate paleofauna

Indeterminate Avialae remains located in Ongtustik Qazaqstan Oblysy, Kazakhstan.

Fish

Amphibians

Turtles

Lizards

Choristoderes

Crocodyliformes

Dinosaurs

Pterosaurs

Mammals

Invertebrate paleofauna

Molluscs

Flora

Conifers

Ferns

References

{{Reflist Geologic formations of Kazakhstan Geologic formations of Kyrgyzstan Geologic formations of Uzbekistan Jurassic System of Asia Jurassic Kazakhstan Bathonian Stage Callovian Stage Sandstone formations Siltstone formations Shale formations Deltaic deposits Fluvial deposits Paleontology in Kazakhstan Paleontology in Kyrgyzstan Paleontology in Uzbekistan